Molecular Structures Using VSEPR
In this lab activity, you will determine the Lewis structures and the three-dimensional geometries of molecular species given only their molecular formulas. This will help you perfect your skill at drawing Lewis structures and help you become better acquainted with molecular geometry by constructing models of the various geometries. You may work in groups, but each student will be responsible for his/her own drawings.
You must do the following for each species on your list below (include a table of items 1, 2, 4, and 5, as shown on p. 2). This should all be done in your lab notebook, as there is not a separate hand-in assignment for this experiment.
NH3 (1 ´ 5 + 3 ´ 1 = 8 valence e–)
3 bonding pairs + 1 lone pair = 4 pairs → tetrahedral e– pair arrangement
C3H8 (3 × 4 + 8 × 1 = 20 valence e–)
4 bonding pairs around each C → tetrahedral molecular geometry for each C
MOLECULAR SPECIES LIST
Unless otherwise stated, assume the first atom listed is the central atom.
For #9-10, there are a variety of Lewis structures (isomers) that could be drawn. Arrange the atoms so that the octet rule is obeyed for all non-hydrogen atoms. Note that the hydrogen atoms will be terminal atoms. In your table, specify the electron pair arrangement and molecular geometry about each unique non-terminal atom.
Suggested Table Format for Notebook:
|Molecular Formula||Lewis Structure||Electron Pair Arrangement (around central
|3D Drawing||Molecular Geometry (around central
Grading: 2 points per species.
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